Why does my computer power supply not have 5 Volts

[MSCMOE]

Hello,
why does my computer power supply show 3 volts and 12 volts but not 5 volts?

 

[jaguarskx]

don't know and you posted in the wrong section.

There should be a 5 volt lead since the hard drive uses both 5v and 12v.

 

[Guest]

This topic has been moved from the section Computer Peripherals to section Systems by Fihart

 

[Onus]

You must be referring to the -5V rail. That rail is obsolete. It was used by some AT expansion cards way back when. Very few PSUs have it any more, and those that do I would not trust to be of sufficient quality to power a modern PC.